Brake



I v Aug. 30, 1927.

INVENTOR WILLIAM J. AN QRES BY w ATTORNEY backing plate or other support 12.

Patented Aug. 30, 1927.

UNITED STATES" WILLIAM J. ANDRES, OF SOUTH BEND, INDIANA, ASSIGNOR T0 BENDIX BRAKE. GOM- PANY, or CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

BRAKE.

Application filed July 25,

This invention relates to brakes, and is illustrated as: embodied in an automobile brake.- An object of the invention is to provide for increasing the effectiveness of a brake utilizing. the drum friction as part of the brake-applying force, by arranging servo means to operate a friction member arranged to wrap either way,-i. e., arranged to anchor at opposite ends when the drum turns in opposite directions.

In one desirable arrangement there, are two unanchored shoes, or other servo devices, spread against the drum, and one operating the friction member when the drum turns in one direction while the other operates it when the drum turns in the opposite direction. Preferably the whole is arranged as a central shoe with servo shoes connected at opposite ends, thus forming a convenient sub-assembly unit for independent shipment and sale.

The above and other objects and features of the invention, including various novel combinations of parts and desirable particular constructions, will be. apparent from the following description of one illustrative embodiment shown in the accompanying drawings, in which: K

Figure 1 is a vertical section through the brake just inside the wheel, showing the shoes in side elevation; and

Figure 2 is a section on the line 2-2 of Figure 1, showing one of the anchors.

In the arrangement selected for illustration, the brake includes a drum 10 and a Within, the drum is a friction member anchorable at either end, and shown as a central shoe 14 of T-section, having relatively large openings in its ends embracing the two anchors 16 and 18 carried by the backing plate 12.

As best shown in Figure 2, each anchor has a head seated against a washer 20 engagin the side of shoe 14 and a spacer 22 is threa ed or otherwise secured on the anchor. Spacer 22 rests against the backing plate 12, which has a comparatively large opening 24 throughwhich the anchor 18 (or 16) passes, thus permitting adjustment of the anchor. The anchor is secured in adjustedpositionby a nut 26 clamping the spacer 22 and a washer-28 against opposite sides of thebacking plate.

At each end of shoe 14'is arranged one of two interchangeable servo shoes 30, each of whi ch is shown forked at its end to provide the anchors. Each shoe 30 is secured to shoe 14 by a pin 36 having a head (not shown) shdably engaging the backing plate 12, and

having a smooth cylindrical shank received in alined openings. in arms 32 and the web of shoe 14, the pins 36 being held in place only by the backing plate. Thus by removing the two nuts 26, and the plate 46, the three shoes may be removed as a unit, and they may also be readily disconnected from each other by removing pins 36.

Springs 38 connected to the backing plate and .to opposite ends of shoe 14 urge that shoe away from the drum to an idle position determined by anchors 16 and 18. A spring or springs 40 urge shoes 30 away fromthe drum.

Shoes 30 are spread apart to expand them against the drum by means shown as a double floating cam 42 of the type fully described in Patent No- 1,604,894, granted Bendix Brake Company October 26, 1926, on application of A. Y. Dodge. Posts 44 passing through slots in the ends of shoes 30 carry aplate 46 engaging the edges of the cam wear plates 48 to confine the ends of the shoes laterally.

When cam 42 is rocked to apply the brake,

Lil

if the drum is turning in a clockwise direction, the right-hand shoe 30 forces shoe 14 against anchor 16, as permited by the relatively large opening embracing anchor 18. The other shoe 30 has at this time comparatively little retarding efiect, as the drum friction tends to swing it inwardly, but it has an important function in guarding against deformation of the drum. If the dum turns counter-clockwise, the left shoe 30 forces shoe 14 against anchor 18 in the sameway.

While one illustrative embodiment of the invention has been described in detail, it is not-my intention to limit its scope to that particular embodiment, or otherwise than by thefterms of the appended claims.

I claim:

1. A brake for a vehicle comprising, in combination, a retarding device, anchoring means engaging the retarding device, and a pair of oppositely-effective servo devices, one of which is arranged to operate the retarding device when the vehicle is moving forward and the other of which is arranged to operate the retarding device when the vehicle is moving backward.

2. A brake comprising, in combination, a drum, a retarding device engageable with the drum, anchoring means engaging the retarding device, and a pair of oppositely-effective servo devices also engagea-ble with said drum, one of which is arranged to operate the re tarding device when the drum is turning in one direction and the other of which is arranged to operate the retarding device when the drum is turning in the opposite direction.

3. A brake comprising, in combination, a

. drum, a retarding device and two servo devices all engaging said drum, anchoring means engaging the retarding device, a connection operated by one servo device for applying the retarding device when the drum is turning in one direction, and a different connection operated by the'other servo device to apply the retarding device when the drum is turning in the other direction.

4. A brake comprising, in combination. a

- drum, a retarding device engageable with the drum and anchoring at its opposite ends according to the direction of movement of the drum, and servo means pivotally connected to the retarding device and urged circumferentially by the friction of the drum and arranged to force the retarding device against the drum in either direction of drum rotation.

5. A brake comprising, in combination, a drum, a retarding device engageable with the drum and anchoring at its opposite ends ac-' cording to the direction of movement of the drum, and a pair of servo devices urged circumferentially by the friction of the drum and so arranged that one or the other forces the retarding device against the drum in either direction of drum rotation.

6. A'brake comprising, in combination, a drum, a friction device within the drum, means at each end of the friction device to, take the braking" torque according to the direction of drum rotation, and servo means connected to the friction device and urged by the friction of the drum to force the friction device against the drum, the friction device and the servo means engaging successively the same surface of the drum.

7. A brake comprising, in combination, a

drum, a friction device within the drum,

means at each end of the friction device to take the braking torque according to the direction of drum rotation, and a servo shoe at each end of said device and one or the other of which shoes is urged b ".ith'e friction of the drum to force the riction device against the drum accordin to the direction of rotation, the friction d evice and the servo shoes engaging successively the same surface of the drum.

the friction of the drum and overcoming the spring means to force the shoe against the drum and against one or the other of the anchors according to the direction of drum rotation.

9. A brake comprising, in combination, a drum, a shoe Within the drum, an anchor at each end of the shoe, a pair of springs connected to the shoe near its ends and urging the shoe away from the drum, and servo means connected to the shoe and urged by the friction of the drum and overcoming the springs to force the shoe against the drum and against one or the other of the anchors according to the direction of drum rotation.

.10. A brake comprising, in combination, a drum, a shoe within the drum having an anchor at each end, .a pair of shoes connected to the first shoe at its ends and engageable with the drum, and means for forcing the pair of shoes apart against the drum.

11. A brake comprising a floating retarding device consisting of connected rigid sections, and anchoring devices arranged at opposite ends of one of said sections, one or the other of the anchoring devices taking the braking torque of the entire retarding device. I 12. A brake comprising, in combination,

a drum, a floating retarding device consisting of connected rigid sections, and anchoring devices arranged at opposite ends of an intermediate one of said sections, one or the other of the anchoring devices takin the braking torque of the entire retarding evice according to the direction of rotation of the drum.

13. A brake comprising, in combination, a drum, a floating retarding device engageable with the drum, and three devices spaced approximately 120 apart. about the drum and including'an expanding device to apply the brake, and two anchoring devices one of which takes the torque of the retarding device when the drum is turnin in one direc= tion and the other of which ta es said torque when the drum is turning in the other direction.

1 4. A friction, device for a brake including, a central shoe, a servo shoe connected to each end of the central shoe, and an anchor. at each end of the central shoe.

15. A friction device for a brake includ ing a central shoe, a servo shoe connected to each end of the central shoe and forked to straddle the end of the central shoe, and an anchor at each end of the central shoe,

the three shoes forming-a connected sub-asshoe at each end of the central shoe and connected thereto at some distance from its end to give the efiect of overla ping the shoes, and an anchor at each end 0 the central shoe passing freely through a relatively large opening in the correspondin servo shoe. 17. A friction device for afizrake comprising, in combination, a central shoe, a servo shoe at each end of the central shoe and connected thereto at some distance from its end to ive the efiect of overla ping the shoes, aim? an anchor at each en of the central 5 oe.

18. A brake comprising, in combination, a drum, a support, a pair of connected opof said other shoe adjustably mounted on the support.

19. A brake comprising, in combination, a

drum, a sup ort, a central shoe, a pair of shoes pivote on the central shoe, and anchors for said central shoe at its opposite ends which are adjustably mounted on the 25 support.

In testimony whereof I have hereunto signed my name.

WILLIAM J. ANDRES. 

